If You Could See Me Now, by Cecelia Ahern (2006, USA)

Elizabeth is a successful young woman, living in Baile na gCroìthe, a small village in the West of Ireland. Her mother left as she was 13 and she grew up her sister Saoirse. Now Saoirse is alcoholic, hardly at home, and Elizabeth is growing up her 6 years old nephew, Luke. But sb arrives. Ivan is the invisible friend of Luke. As his colleagues, he can be seen only by whom believes and needs him. And Elizabeth can see him too, although unaware of him to be an imaginary friend (nevertheless real). A strange love story that changes everything.

Unseen Academicals, by Terry Pratchett (2009, UK)

Disk world. Mr Nutt arrives at the Unseen University and begins working there. He knows EVERYTHING. He's very kind. He's got worth. But he's an orc, although he doesn't know. It's all about the wizards playing the old foot the ball, Glenda that's wise and runs the Night Kitchen, Trevor who lits the candles, Juliet, who shines, the big football match. And Nutt gaining worth. Deep and hilarious.

The Water Is Wide, by Pat Conroy (1972, USA)

Pat is a teacher grown up in South Carolina, sent teaching on Yamacraw Island: the high school here is ruled by Mrs Brown, who believes in discipline and violent methods. Guys are black people, poorly educated, knowing very few of the world. Pat, bringing new ways of teaching, starts a war against racism and bureaucracy. Deep.